As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTS AIRCRAFT FMS READING "NO DATA BASE MEMORY". AFTER FURTHER INSPECTION FOUND NR 1 FMC CARD BATTERY FAILED ON NR 1 FMC CARD. REPLACED NR 1 FMC CARD, AFTER FMC CARD REPLACEMENT NR 1 FMS OPERATIONS CHECKED GOOD. AIRCRAFT OK FOR RETURN TO SERVICE.